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Pretty cool, region inference is handled via miniKanren, a relational / constraint logic programming embedding in Scheme (also available in Clojure as core.logic):

http://github.com/eholk/harlan/blob/master/harlan/middle/inf...

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We did start out with a miniKanren type inferencer and region inferencer, but I replaced it a couple months back with a unified type and region inferencer. Region inference is definitely an interesting challenge for miniKanren, since a lot of the constraints it introduces are soft. There are many legal region assignments, but deciding the best one requires some heuristics.

I see, thanks for the update! :)

Have you looked at GPUVerify[1] from Imperial College to verify the correctness of code produced?

[1] - http://multicore.doc.ic.ac.uk/tools/GPUVerify/

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